(Delphi DLL) HTTP multipart/form-data Upload

Demonstrates how to upload files to an HTTP server using a multipart/form-data POST.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, HttpRequest, HttpResponse;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
req: HCkHttpRequest;
success: Boolean;
resp: HCkHttpResponse;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

http := CkHttp_Create();

req := CkHttpRequest_Create();
CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'multipart/form-data');
CkHttpRequest_putPath(req,'rcvFormDataUpload.aspx');

// Send an "Expect: 100-continue" header in the request.
// This causes the HTTP server to end a 100-continue response
// immediately after receiving the HTTP header.  The client
// (Chilkat) will receive this intermediate response, and if
// it's not an error response, it knows that the HTTP server will
// accept the data that is forthcoming.
// The alternative is to get an error response after trying to upload
// the entire contents of the files.
CkHttpRequest_AddHeader(req,'Expect','100-continue');

// Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
// To allow Chilkat to determine the content-type automatically based on file-extension,
// call AddFileForUpload instead.

// The 1st arg is the filename passed in the HTTP request.
// The 2nd arg is the path in the local filesytem.
// The file is not loaded into memory.  It is streamed directly from the file
// when the HTTP POST is sent.
success := CkHttpRequest_AddFileForUpload2(req,'starfish.jpg','c:/qa_data/starfish.jpg','image/jpg');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkHttpRequest__lastErrorText(req));
    Exit;
  end;

success := CkHttpRequest_AddFileForUpload(req,'something.pdf','c:/qa_data/something.pdf');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkHttpRequest__lastErrorText(req));
    Exit;
  end;

// Its also possible to add a file from a string:
success := CkHttpRequest_AddStringForUpload(req,'test.xml','test.xml','<abc>This is the test.xml content</abc>','utf-8');
// We'll assume success since no files are involved..

// This sends the HTTP request (with 3 files being uploaded) to
// http://www.mywebserver123abc.com/rcvFormDataUpload.aspx

resp := CkHttp_SynchronousRequest(http,'www.mywebserver123abc.com',80,False,req);
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
  end
else
  begin
    Memo1.Lines.Add('HTTP response status: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
    // See the online reference documentation for 
    // other information that can be obtained from the response object.
    CkHttpResponse_Dispose(resp);
  end;

// To send using SSL/TLS, do this instead.
// This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
resp := CkHttp_SynchronousRequest(http,'www.mywebserver123abc.com',443,True,req);
if (CkHttp_getLastMethodSuccess(http) <> True) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
  end
else
  begin
    Memo1.Lines.Add('HTTP response status: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
    // See the online reference documentation for 
    // other information that can be obtained from the response object.
    CkHttpResponse_Dispose(resp);
  end;

CkHttp_Dispose(http);
CkHttpRequest_Dispose(req);

end;